I have tested the tool and it worked very well.
I had a crash at some point but after that I tried really hard to reproduce it and I couldn’t. In the error message there was something about an id that didn’t exist. Unfortunatly I didn’t think in the moment to make a screenshot. If it happens again I will report it.

It was the first time that I used any tool of the “operations” and at first I didn’t understand that I had to press enter, because I didn’t notice the tool tip down. Once I noticed it and saw what I had to do I was perfect.

Maybe the Tool tip could be made a bit more visible (for instance another color), when using a tool for the first time? In order to draw the attention of the user?

I am having problems with the tool as well. It actually worked a few times, but today I could not get it to work at all. I am using the latest test version downloaded yesterday on a mac.

Here’s what happens. I was trying to replicate a waist dart which is made up of two lines.

I click on symmetry tool (mirror on axis for example)

tooltip says to select an object. I selected a line (and a dotted rectangle appears around it)

I tried using shift / command key to select another object (the other dart line) but nothing happens. The tooltip doesn’t say which key to use to select more than one object but I am assuming it is one of this two. Anyway nothing happens, so I give up and was going to mirror the lines one at a time, so I click Enter

Then this pops up
and then the program crashes.

The same thing happens when I use the other symmetry tool (mirror by line). Just that every time it is a different id number reported.